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Treatment and Post‐Mortem Aging Effects on the Z‐line of Myofibrils from Chicken Pectoral Muscle
Author(s) -
FUKAZAWA T.,
BRISKEY E. J.,
TAKAHASHI F.,
YASUI T.
Publication year - 1969
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1969.tb12101.x
Subject(s) - myofibril , sarcomere , fragmentation (computing) , electron microscope , biophysics , anatomy , chemistry , myocyte , actin , biology , sarcoplasm , pectoral muscle , electron micrographs , phase contrast microscopy , microbiology and biotechnology , biochemistry , endoplasmic reticulum , optics , ecology , physics
SUMMARY: Changes in the morphology of myofibrils prepared from chicken pectoral muscle during post‐mortem storage at 5°C were examined by light and electron microscopy. When the 24‐hr stored samples were blendorized, electron micrographs showed two types of destruction in the Z‐lines of sarcomeres and myofibrillar fragments: (1) The degradation and/or disappearance of Z‐lines. (2) The breakdown of the junction of Z‐line and I‐filaments. A change in the state of the Z‐line and the junction of the Z‐line and I‐filaments appeared to be indispensable for the fragmentation of the myofibrils. It was also shown through phase contrast microscopic observations that sarcoplasmic proteins, participating in the glycolytic cycle, may play a role in the fragmentation of the myofibrils. Evidence has not been obtained, to date, on the participation of proteolytic enzymes in the fragmentation phenomenon.